flood.js
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export default class flood {
constructor(viewer) {
this.positions2d = [];
this.handlerPolygon = new Cesium.DrawHandler(viewer, Cesium.DrawMode.Polygon);
this.handlerPolygon.drawEvt.addEventListener(polygon => {
var array = [].concat(polygon.object.positions), positions = [];
for(var i = 0, len = array.length; i < len; i++){
var cartographic = Cesium.Cartographic.fromCartesian(array[i]);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.Math.toDegrees(cartographic.latitude);
var h=cartographic.height;
if(positions.indexOf(longitude)===-1&&positions.indexOf(latitude)===-1){
positions.push(longitude);
positions.push(latitude);
positions.push(h);
this.positions2d.push(longitude);
this.positions2d.push(latitude);
this.positions2d.push(1000.0);
}
}
return positions;
});
}
initHyp() {
var hyp = new Cesium.HypsometricSetting();
//设置显示模式
hyp.DisplayMode = Cesium.HypsometricSettingEnum.DisplayMode.FACE;
//设置线颜色为红色
hyp._lineColor = new Cesium.Color(1.0, 0.0, 0.0, 1.0);
//设置最大/最小可见高度
hyp.MinVisibleValue = 0;
//设置颜色表的最大/最小key值,表示高度
hyp.ColorTableMinKey = 1;
hyp.ColorTableMaxKey = 9000;
//新建颜色表
var colorTable = new Cesium.ColorTable();
var height = 1;
//每隔200m向颜色表插入一个随机色
for(var i = 0; i<90; i++){
height += 200;
colorTable.insert(height, getRandomColor());
}
//返回随机颜色
function getRandomColor(){
return new Cesium.Color(Math.random(), Math.random(), Math.random());
}
hyp.ColorTable = colorTable;
hyp.Opacity = 0.8;
//等高线间隔为200m
hyp.LineInterval = 200.0;
return hyp;
}
floodCal(entities, positions2d, waterHeight, targetHeight) {
let entity = entities.add({
polygon : {
hierarchy : new Cesium.PolygonHierarchy(Cesium.Cartesian3.fromDegreesArrayHeights(positions2d)),
perPositionHeight: true,
extrudedHeight: new Cesium.CallbackProperty(function(){
waterHeight+=20;
if(waterHeight>targetHeight){
waterHeight=targetHeight;//给个最大值
}
return waterHeight
}, false),
material: new Cesium.ImageMaterialProperty({
image: './images/waterNormals.jpg',
repeat : new Cesium.Cartesian2(1, 1),
transparent: true
})
}
});
}
floodParse(scene, positions2d, waterHeight, targetHeight) {
var River1 = new Cesium.Primitive({
geometryInstances : new Cesium.GeometryInstance({
geometry :new Cesium.PolygonGeometry({
polygonHierarchy : new Cesium.PolygonHierarchy(Cesium.Cartesian3.fromDegreesArrayHeights(positions2d)),
extrudedHeight: targetHeight,
height: waterHeight,
vertexFormat : Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT
})
}),
appearance : new Cesium.EllipsoidSurfaceAppearance({
aboveGround : true,
material: new Cesium.Material({
fabric : {
type : 'Water',
uniforms : {
normalMap:'./images/waterNormals.jpg',
frequency: 100.0,
animationSpeed: 0.01,
amplitude: 10.0
}
}
})
}),
show : true
});
scene.primitives.add(River1);
}
}